There are hundreds of kinds of 'plastics', each with their own best glues.For instance, what glues ABS, will not glue PVC, what glues polystyrene will not glue Lexan. -You must specify a plastic.
There are many 'plastics' and each has it's own solvent or glue. You need to tell us what kind of plastic you have.
For an edge butt joint use biscuits, or a continuous spline, and glue.
ALL plastics have their own particular glue or solvent - USE it rather than any other.
I only use white glue for paper or lightweight wood 'fixes'. - Heavier wood repairs need yellow carpenter's glue and possibly 'biscuit' joints. - Metals and plastics of any kind are NOT at all suitable for white glue.
You use wood glue for sticking pieces of wood together.
You have to use glue of course and you need someone to hold it together while you glue it
It is glue.
you have to use a hot glue gun.
sticking things together
Yes, I believe so. You can use wood glue on foam.
I would use a hot glue gun.
Use a hot glue gun.